21892697531 has 4 divisors (see below), whose sum is σ = 21920516232. Its totient is φ = 21864878832.

The previous prime is 21892697521. The next prime is 21892697549. The reversal of 21892697531 is 13579629812.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21892697531 - 2⁶ = 21892697467 is a prime.

It is a super-2 number, since 2×21892697531² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21892697521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13908170 + ... + 13909743.

It is an arithmetic number, because the mean of its divisors is an integer number (5480129058).

Almost surely, 2^21892697531 is an apocalyptic number.

21892697531 is a deficient number, since it is larger than the sum of its proper divisors (27818701).

21892697531 is an equidigital number, since it uses as much as digits as its factorization.

21892697531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27818700.

The product of its digits is 1632960, while the sum is 53.

The spelling of 21892697531 in words is "twenty-one billion, eight hundred ninety-two million, six hundred ninety-seven thousand, five hundred thirty-one".